List of potentionally useful information that can be obtained with SLACK API calls:

• channels.history:
  • list of all messages, events
  • timestamps of these messages
• users.info:
  • name, real name, team name, e-mail
  • info about user being admin, owner, bot, restriced/ultra-restricted
• channels.info:
  • all members
  • scope of the channel (private, public, mpim..)
  • latest message
  • number of unread messages
  • topic
  • previous names